The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 1990
Filed:
Jul. 26, 1989
Guenter Doemens, Holzkirchen, DE;
Markus Gilch, Hoergertshausen, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
A sensor for measuring the torque acting on a rotating shaft has two electrode structures which are respectively mechanically coupled to two axially spaced points on the shaft to be measured so that a relative movement between the two electrode structures occurs due to the torque. The electrode structures each have a number of parallel, spaced electrodes and are asymmetrically mounted in a plane so that a number of capacitors are formed by electrode pairs each having an electrode from each electrode structure. Because of the asymmetrical arrangement, the electrodes in a pair are spaced a relatively large distance away from the next closest electrode, so that a capacitive decoupling between the pairs is achieved. Changes in the spacing between the points on the shaft due to torsion of the shaft caused by the torque will change the spacing between the electrodes in each pair, thereby resulting in a total capacitance change which is proportional to the torque. To compensate for the influence of transverse forces or bending moments acting on the shaft, a further capacitor arrangement identical to the first arrangement is arranged at an angle of 180.degree. with respect to the first arrangement, with the capacitance used for the purpose of measurement being the capacitances of the two capacitor arrangements in the series.